XYY Syndrome

National Organization for Rare Disorders, Inc.

Important
It is possible that the main title of the report XYY Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.

Synonyms

  • 47,XYY Karyotype
  • 47,XYY Syndrome
  • Diplo-Y Syndrome
  • Polysomy Y
  • XYY Chromosome Pattern
  • YY Syndrome

Disorder Subdivisions

  • None

General Discussion

XYY syndrome is a rare chromosomal disorder that affects males. It is caused by the presence of an extra Y chromosome. Males normally have one X and one Y chromosome. However, individuals with this syndrome have one X and two Y chromosome. Affected individuals are usually very tall and thin. Many experience severe acne during adolescence. Additional symptoms may include antisocial or behavioral problems and learning disabilities. Intelligence is usually normal, although IQ, on average, is 10 to 15 points lower than siblings.
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Resources

March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
Tel: (914)997-4488
Fax: (914)997-4763
Tel: (888)663-4637
Email: Askus@marchofdimes.com
Internet: http://www.marchofdimes.com

National Mental Health Consumers' Self-Help Clearinghouse
1211 Chestnut Street
Suite 1207
Philadelphia, PA 19107-6312
USA
Tel: (215)751-1810
Fax: (215)636-6312
Tel: (800)553-4539
Email: info@mhselfhelp.org
Internet: http://www.mhselfhelp.org

National Mental Health Association
2000 North Beauregard Street
6th Floor
Alexandria, VA 22311
USA
Tel: (703)684-7722
Fax: (703)684-5968
Tel: (800)969-6642
TDD: (800)433-5959
Email: infoctr@nmha.org
Internet: http://www.nmha.org

National Alliance for the Mentally Ill
Colonial Place Three
2107 Wilson Blvd.
Suite 300
Arlington, VA 22201-3042
Tel: (703)524-7600
Fax: (703)524-9094
Tel: (800)999-6264
TDD: (703)516-7227
Email: membership@nami.org
Internet: http://www.nami.org

NIH/National Institute of Mental Health
6001 Executive Blvd
Rm 8184, MSC 9663
Rockville, MD 20892-9663
Tel: (301)443-4513
Email: nimhinfo@nih.gov
Internet: http://www.nimh.nih.gov/

UNIQUE - Rare Chromosome Disorder Support Group
P.O. Box 2189
Caterham
Surrey, Intl CR3 5GN
United Kingdom
Tel: 44 0 1883 330766
Fax: 44 0 1883 330766
Email: info@rarechromo.org
Internet: http://www.rarechromo.org

MUMS National Parent-to-Parent Network
150 Custer Court
Green Bay, WI 54301-1243
USA
Tel: (920)336-5333
Fax: (920)339-0995
Tel: (877)336-5333
Email: mums@netnet.net
Internet: http://www.netnet.net/mums/

Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
Tel: (301)251-4925
Fax: (301)251-4911
Tel: (888)205-2311
TDD: (888)205-3223
Email: ordr@od.nih.gov
Internet: http://rarediseases.info.nih.gov/Default.aspx

Klinefelter Syndrome & Associates (KS&A)
P.O. Box 461047
Aurora, CO 80046-1047
Tel: (303)400-9040
Fax: (303)400-3454
Tel: (888)999-9428
Email: info@genetic.org
Internet: http://www.genetic.org

For a Complete Report

For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ® (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html

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